Warp stop-motion for looms



(No Model.) I 1 H. NORTl-IROP.

WARP STOP MOTION FOR Looms. I No. 583,416. Pa tente d May 25, 1897.

, To all, whom/it may concern Y Be it 'known'that-I, JAMES HIQN RTHROP,

* UNITED STATES I PATENT FFIC'E.

JAMES H. NORTHROP, or HQPEDALE, MASSACH SETTS, AssIeivoR o THE. f

DRAPER, coMPANY, F SAME PLACE ANnPoRT A-ND, MAINE.

3 wARPjsTop M'oTl-oN' Foe Looms SPECIFICATION forming part of Letters I-atent No. 58,416, dated May 25, 1 897. hpplicatioufile l January 11, 1897. Serial no; 618,751; (No we.)

of Hopedale, county otWorcester, State of Massachusetts, have inventedan Improve ment in Warp Stop-Motions for 'Looms,',of which the following description, in connection with the accompanyingdraw.ings,.is a

specificatiomlike letters and figures on the drawings representing like parts.

This invention has for its object the pro-,

du'ction of a warp stop motion forlooms wherein a-series of vertically-reci'procated.

stop-moiion actuating detectors, preferablyserving also as hedd1es,-a ct, when in abnor mal position dueto failure or undue slack+ ness of their warpthreads, directly upon stopping mechanism for the loom independentofthe means for reciprocating the detec tors and control the operation thereof, ef-

fectedvby vertical movementof saidmeans.

Inasmuch as the operation of the stopping mechanism is effected-by the movement of the Y means for reciprocating the actuating-detectors, the set ofthe harness-cams is immate-' rial when-said detectors also serve as he'ddles,

V as shown in the present embodiment of my invention, for the change in positionjof the harness-itself eflects the operation of the stopping mechanism-when a deteotor-heddle' 1s 1n abnormal pos1tion, and as a consequence thenice adjustment-to secure the proper cooperation of detector mechanism and harness- )perating mechanism is obviated. Su'ch adustment ismecessary in other forms of warp stop-motions in order to render the same op-' erative, and at times the adjustment is a long and delicate matter productive of delay and decreased. output of the 100m. 'I

utilize the vertical movement of the means for-reciprocating the detectors to vibrate a feeler,-whicl1 feeleris-direetly engaged by a detector in abnormal position, such: engagement controlling the operation of the stop ping mechanism for'the loom effected by movement of the detector reciprocating means,-the said stopping mechanism being independentof the latter, and by stopping mechanism for the loom I include, broadly,

the devices intermediate thebelt-shifterand the detector-reciprocating means. j

Figure Lin side-elevation and partly in section, represents a sufficient portion of-a 100111 to be understood with m yinvention applied I thereto,- the 100111 side being broken out and various details of the loomof usual construction omitted to avoid confusion, Fig. 2 is an enlarged perspective detail-of a portion of the stopping mechanism of the-loom, show-j the teeler. Fig. 3, in side ,elevation,-represents the position assumed by the feeler and its connected mechanism when the feeler is engaged by a detector in abnormal position.

ing the connection between said portion and Fig. 4: is a detail showing the feeler at the opposite end of the throw from that shownin Fig. 1, and Fig. 5 is an enlarged detail'of-the also utilized as heddles, the detectors D be ing represented as made of thin strips of sheet metal provided eachwith a warp-receivingx' eye 2-and an elongated slot 3, which is eu- 'tered by a cross-bar c of less depth-than the length of the slot, the cross-bar forming part. of'a vertically-reciprocatingharness-frame or detector-support, substantially as shown in United States Patent No. 536,969, dated April .2, 1895,,the harness cams and treadles bein-g herein. omitted. for the sake'of clearness.- As

in said'patent, the elongated slots'enable the independently-of the vertical movement of vthe -supporting-frame, whereby breakage or undue slackness of awarp-thread will permit its detector-heddle to move into abnormal operative position to e'fiect, through intervening mechanism, the stoppageof 'the loom'.

The' loom-frame A, of suitable shape,is proon a stand 5-, (see Fig. 1,).the pivot permitting'fslight lateral movement of the lever lever I when released from'the notched he. holding-plate B in usual manner to shift the vided with. a" shipper-lever B, pivoted .at B

belt from the fast to the loose pulley (not shown) and therebyst'op .thezloom. [A thin upright plate or bar 0' is extended across the loom between the two series of detectors D at their lower ends to-maintain them separate, and a second smaller'bar c ,1 1g. 1,parj l If the dog is in the pathv of the hunter D as.

changing the shed.

allel to the separators", is extended across the loom in front of the front series of detect: 01's to prevent their displacement in the direction of travel of the warps and also to serve as a rest or support for the warpsthreads in the lower plane of the shed.

The side barsa of the harness orsupport ing frames are downwardly extended and op positely bent at their lower ends, as at w, and

to each is secnredl-a depending lug aiat or to swing the latter laterallyon its pivot .B'

when the arm d is rocked, and thereby withdraw the shipper-lever from the notch in the holding-plate 13 A lateral stud 7- on the rocker-arm provides a fulcrum for a dog d preferablyhaving at its rear enda shoulder (Z to cooperate'with a hunter b shown in,

dotted lines, Fig. '1, and in section in Fig. '5 as a pin on'an arm Z of a rotatable shaftb having fast thereon a gear I) in mesh with and rotated by a gear 1), fast on one of the continnously-rotated shafts,as O, of the 100m.

it is rotated in the direction of arrow 15, Fig. 1, the rocker-arm (1 will bemoved to act upon and withdraw the shipper-lever B from its holding-plate and thereby stop the loom.

I As bestshown in Figs.-2 and 5, the rear end of thedog cl, projecting; beyondthc shoulder (2 is oppositely beveled, as at d, and the hunter 1) is likewise beveled at 11 (see Fig. 5) for a part of its circumference, so that if the movement of the dog, to be described, should notbe-alwaysquick enough to move-its projecting end relatively to the path of the bun-' ter the beveled portions of said hunter and dogwill slide over each other without injury. Verethe end of the dog made blunt andthe hunter cylindricahsuch engagement would disarrange the operation of the parts and might result in i-njnry to the loom. A rockshaft f, mounted in the bearing (1, has fast thereon at its end adjacent the dog (1 an arm f, provided with an ear f extended beneathsaid dog, the latter being maintained in engagementwith said arm by a springs, at;

tached at one end to the dog and at its other end to a projecting part (i of the leg cl, the rocking of the shaft f thnscontrolling thepos sition ofthedog d? relatively to the path. of the hunter 0*. Two feelers f which may be angle-bars, are herein'shown as secured to bifurcated arms h, only one of which is shown, fast on a rocking shaft 71 mounted in suitable bearings and below the separator c, the feelers having their acting longitudinal edges "Fig. 2, first acting to facing each-other, so that when 1 he shaft his oscillated or roc-kedthe feelers will be vibrated in the direction of the length of the. warpthreads toward and away from the vertical pathsin which the two-series of detectors D arereciprocated. Normally the feelers Will be vibrated freely andbeneath the detectors,

as shown in Figs. 1 and 4, the extreme vibration in each direction being shown therein; but if a detector drops into abnormal position by reason of breakage or undue slackness of its warp-thread its lower end will be in the path of movement of and engage its cooperating feeler as the latter is moved toward it. One of the arms his preferably extended below therook-shaft 71' andis transversely slotted at kg to receive'a bolt 8, passed through a depending arm 7L3, mounted at its upper end on the rock-shaft, the bolt and 's'lotproviding convenient means for adjusting the feelers-when setting up the loom, so that their action on their respective detectors will be equal. f 1

'lhe'lower end of the-arm 7L3 is-pivotally connected atD to a short link-7L whiehin turn is jointed at 1'2 to an arm f, fast on the rock-shaft f, projecting beyond the innerend of the hearing (I the 'arm h andlink Informing the two members of a toggle.

A spring S is attached at o'ne'end to the bearing (Z and at its other end to the arm f,

the spring normally tcndin g to return the arm andro'ck-shaft into' the position shown in Figs. 1, Ehaud i. l

Adjacent the pivot 1) the arm 71, is oifset or bent, as at'hflsubstantially at a right angle and provided with a lateral pin or stud ill-to enter loosely the longitudinal. slot g in a rocker-arm g, loosely mounted on the shaft f and providedwithoppositely-extended p rojections or feet g q at the front and rear of the longitudinal axis of the lOClQ-Sllt'tfhyl'O- spectively, and adapted to be engaged alternately by the lugs a on the harness-frames on the. descent of the latter. Suppose the parts to be in the position. shown in. Figs]. and 2, the feelers f3 being at the warmest end of their throw or vibration,- and le' it lic .supposed'that r the rear harness-frame is to descend. \Vhen the luga thereonengages the foot it depresse the latter and swings the arm gin thedi onrof thearrow ii), lighten the toggle 71 ha. this act of straightening the toggle-depressing the arm f -and rocking the shaftf to lift its arm f',.the latterraising tho-dog into the path of th uni-er b If no detector is in abnormal position, the continued swing of the arm (1 will carry the joint-line of the toggle past its center or out of line with the rock-shaft h and joint-12, andihe springs S S will immediatelyact to returi'i'thc shaftfand arm f 'andthe dog to normal position with the latter out of the hunter-path, this movement of the short arm f" completing the swing or vibration of the feelers and the arm g, the feet g and g moving into the positionshown in Fig. 4, it being noticed that the lug a at the completion of its stroke falls somewhat short of the foot 1 On the descent of the-front harness-frames its lug a will act on the foot g, referring now to Fig. 4, depressing. said foot to throw the arm g to the right, swinging'the feelers and turn the dog to inoperative position,the feelers and themechanism! described resuming the position shown in Figs. 1 and 2. Accordingly at each normal vibration the dog d is moved into and out of operative position, the

initial and main portion of the vibration of the feelers being efiected by'the vertical movement of the harness-frames, while the vibration is-completed by the spring action described. If, however, a detector is in abnormal position, (shown in Fig. 3,) it will engage the feeler after the partial rotation of the rock-shaft f has moved the dog (1 into operative position, preventing further vibratory movement of the arm h and the short arm f cannot return to normal position, it acting, through its spring S, stronger than the spring S, to hold the rock-shaft, with the 1 arm f, elevated to erative position. dog will accordingly be engaged by the hunter The shoulder d of said b and said dog'will .be moved. longitudinally to cfiect, through the rocker-arm d and link d the releaseof the shipper-lever, stopping I farther.

the. loom. Asthe depending arm 72 is held by the engagement of the feeler-with the dropped detector, the arm 9 cannot complete its swing to give the final movement to, the

feeler, and the feet gig will be maintained in the position shown in Fig. 3, but the lug a, cooperating with the foot g is then at the end of its downward stroke, (see Fig. 3,) and hence cannot act to force the foot down any It will be obvious from the foregoing that the stopping mechanism for the loom, while independent of the reciprocating detector support or frame, is controlled by the engagement of a detector in abnormal position with its feeler, the vibration. of the latter-being efieeted by vertical movement of they detector frame or support.

The part of the dog-overhanging the shoulder (1 prevents-the accidental disengagement of the hunter before the release of the ship per-lever has been effected. 1

'In looms heretofore devised using heddles which arealso employed as stop-motion detectors to cooperate with a vibrator or feeler and stop the loom when a warp-thread breaks change of position of. the heddle-frames, such as is frequently necessary to produce certain efiects in weaving, makes it nec ssary to ad- -p 'ust or change the position of th vibratpr .or

maintain the dog (1 in op-- feeler, so that it may work with the dropped heddle, and frequently in such looms there arises the necessity of making adjustments in the heddl'e-fram es, with which the vibrator or feeler cannot without great trouble be adjusted to work properly. To'overcome this difficulty of adjusting the vibrator or feeler,

I have made the detectors effective in controlling the operation of the stopping mechanism efiected by reciprocation of the heddleframes.

Having described my invention, what I claim as new, and desireto secure by Letters Patent, is-

1. In a loom, a series of warp-stop-motionactuating detectors, means to support and reciprocate said detectors vertically, said de- I tectors having a limited vertical movement relative thereto, and stopping mechanism independent of said means, a detector in abnormal position, due to failure or undue slackness of its Warp-thread,- acting directly upon and controlling the operation of thestopping mechanism by movement of the said reciprocating means, substantially as described.

2. In a loom, shedding mechanism, including a series of vertically and independently movable stop-motion-actua'tin g detector-heddies, and stoppingmechanism for the loom independent of said shedding mechanism, a detector-hedd 'e in abnormal position, due to failure or undue slackness of itswarp-thre'ad, acting directly-upon and controllingthe operation of the stopping mechanismby verti-H cal movement of the shedding mechanism, substantially as described. 1 Q

3. In a warp stop-motion for looms the following instrumentalities,viz series of warp-' stop motion-actuating detectors, means to support and reciprocate them vertically, and stopping mechanism for the loom, independent of saidlmeans, and including a feeler normally vibrated by reciprocation of said means, a detector in abnormal position engaging said IO J feeler and through "it controlling the'operation of said stopping mechanism, substantially as described.

4. In a warp stop-motion for looms the following instru mentalities,viz: a-series of Warpstop-motionactuating detectors, means to supportand reciprocate them vertically, and stopping mechanism for the loom, independ-. ent of said means, and including a feeler initially vibrated by reciprocation of said means,

a spring to normally effect the final vibration of the feeler, a detector in abnormal position engaging and preventing the complete'vibration of the. feeler and thereby effecting the operation of the stopping mechanism, substantially as described.

5. In a warp stop-motionfor looms, the following instrumentalities, viz 'a series of hed- "dle-fra'mes prbvided with heddles adapted to act as warp stop detectors, a lug on each frame, means to reciprocate the frames, stop-1' ing mechanism for the loom independent of, said frames and including a feeler, and means;v

described.

'to ivibrate it in the directional. the length of 7. in awarp step-motion forfloo'ms the 1:01- 2 the warps, saidmeans being actuated initially byengage'mentof. the lugs on the heddleframes, and a spring to normally com plete the vibration of the feeler, a detector in abnormal position engaging the feeler and preventing the action of-the spring, su'bstantially' as 6. Ina warp stop-'motion'for loomsthejfollowinginstrumentalities, viz: a series of heddle-frames provided with heddles adapted to not as .warprstop detectors, means to reipro: eat-e said frames, at shipper-lever, anormall'y' inoperative releasing-dog therefor, a cooper.-

ating continuously-rotated banter, a vibratingifeelert to engage a detector in abnormal position, and connections between 'saidfeeler anddog, the Vibration of the feelerv being effected by vertical movement ofvthe he'ddleabnormal position byits feelera'ctingto main-' ;tain the dog in its operative frames to move the .dog into and out of operative position, engagement of a detector in position, substantially asdesoribed.

lowing instrumentalities, Viz: ,a vibrating 'feeler,a rock-shafthavin g an'arm fast thereon,

a linkconnecting said arm and a depending V 7 portion of the feelerto form a toggle, a rockerarrn loosely mounted on-the rock-shaft and connected to the joint 'ofthe toggle, and a spring to a normally maintain the 'toggle broken, combined with a shipper-lever, a releasing-dog therefor controlled as to its posiition by said rock-shaft, a cooperating hunter,

connections between the dog and shipper- In testimony whereof I have signed my name to this specification in the presence of two subscribingwitnesses; v v

n J MEsH'. NoR'rI-moP.

Witnesses:

E, W LTERDAVE PORT, GEO. OTIS DRAPER.

lever, anclmeans to swing the rocker-arm and 

